Dr Jay Wiles22 January 2026

A Masterclass in Improving Your HRV - Dr Jay Wiles - #1049

2Frameworks

12Insights

Frameworks in this episode

Self-Mastery5 steps

Personalized HRV Trend Review

Judge HRV against your own baseline, stability, and context

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Peak Performance6 steps

Resonance Breathing Trait-Change Protocol

Train nervous-system flexibility with precise, repeated breathing

Read →

Insights & moments

The myth-busts, hot takes, explainers, and tools worth keeping.

Myth Buster· 3

Myth Buster04:30

The Autonomic Nervous System Is Not an On-Off Seesaw

Wiles reframes the sympathetic branch as a system for mobilizing energy and the parasympathetic branch as a system for conserving energy. He argues that both branches work together rather than switching each other on and off.

The sympathetic branch mobilizes energy in response to threat
The parasympathetic branch conserves energy
The two branches cooperate rather than behave as a simple seesaw

“I actually think that to conceptualize the paras or sorry the sympathetic response. It's much more of a way that we mobilize energy.”
Dr Jay Wiles · 05:00

“They actually work together.”
Dr Jay Wiles · 06:00

#nervous system#sympathetic#parasympathetic

Myth Buster26:30

HRV Does Not Directly Measure How Stressed You Are

A single HRV value cannot place someone on a psychological stress scale. Across time, HRV can instead provide evidence about how flexibly the nervous system adapts to physiological and psychological demands.

One reading has almost no useful stress context
Physiological and psychological stress can both affect the body
The useful signal is adaptability to stress across time
Treating one score as a decision command can create a self-fulfilling prophecy

“HIV is not a measure of direct stress.”
Dr Jay Wiles · 26:30

“One singular reading outside of any context in regards to HRV isn't a signaling window to me telling you I can see how, you know,…”
Dr Jay Wiles · 27:30

#stress#hrv#wearables#adaptability

Myth Buster2:04:30

Why HRV Is Not a Catch-All Health or Longevity Metric

HRV becomes misleading when used as a universal health score or a daily instruction engine. Wiles says it is less robust for general wellness than VO2 max, is not meaningfully normative for individuals, and is most useful as a real-time training signal or contextual personal trend.

HRV should not dictate behaviour from one daily value
A single wearable number omits the wider family of HRV metrics
Falling outside an age-group norm does not prove poor health
VO2 max is a stronger general fitness metric in Wiles's comparison

“when people want to use HRV as like a catch-all metric for health, wellness, and longevity, I think that that is immensely poor way to…”
Dr Jay Wiles · 2:04:30

“HRV is not nearly as robust of a metric for telling you something about your physiology as something like V2 max.”
Dr Jay Wiles · 2:06:30

#hrv#longevity#vo2 max#wearables

Hot Take· 1

Hot Take53:30

Most Breathwork Evidence Shows State Change, Not Trait Change

Wiles distinguishes the immediate effects people seek from breathwork from evidence of durable nervous-system adaptation. He says many popular practices may be useful for relaxation or catharsis while lacking the robust longitudinal evidence he attributes to resonance breathing.

An acute change can still be valuable without proving a lasting adaptation
Popular breathwork methods often target energy, calm, or emotional release
Wiles says robust trait-change studies are missing for many novel practices
He remains open to changing his view if stronger evidence appears

“The one thing that all those breath work practices that you mentioned don't have are robust studies demonstrating trait change.”
Dr Jay Wiles · 54:30

“I just think that a lot of it's just been people have taken way too much advantage of it.”
Dr Jay Wiles · 54:30

#breathwork#evidence#state change#trait change

Explainer· 5

Explainer07:30

Why a Healthy Heart Does Not Beat Like a Metronome

A 60-beat-per-minute heart rate does not mean each beat arrives exactly one second apart. The changing intervals between beats reflect the nervous system's continual adjustments, with variability tending to shrink when adaptation becomes difficult.

Heart rate averages conceal beat-to-beat timing changes
Breathing contributes to shorter and longer intervals between beats
Reduced variance can indicate that the body is struggling to adapt

“The heart actually doesn't operate like a metronome.”
Dr Jay Wiles · 08:00

“That variance tells us something about the fine tunements that your nervous system is making to adjust to its environment.”
Dr Jay Wiles · 09:30

#hrv#heart rate#adaptation

Explainer15:30

Age, Genetics, and Sex Shape HRV Before Lifestyle Does

Wiles identifies age, genetics, and sex as major non-modifiable influences on baseline HRV. These differences help explain why an extremely fit athlete can have a much lower absolute score than another athlete without that number proving poorer health.

Baseline HRV tends to decline with age
Genetic predisposition can produce large differences between people
Men average higher HRV than women in the literature Wiles discusses
Absolute HRV is not established as a standalone longevity metric

“The first one's age. Like age is one of the primary uh non-modifiable factors that we see within the literature.”
Dr Jay Wiles · 16:00

“some people are actually just born with a genetic predisposition towards lower heart rate variability.”
Dr Jay Wiles · 17:30

#genetics#ageing#sex differences#hrv

Explainer41:00

How Blood-Pressure Regulation Can Affect Mental Acuity

Wiles describes the baroreflex as cruise control for blood pressure and a bridge between cardiovascular and autonomic systems. When regulation repeatedly overshoots, the resulting physiological alarm can redirect attention toward perceived threat instead of focused thinking.

The baroreflex continually adjusts blood pressure
Dysregulation can cause abrupt physiological overcorrection
Perceived threats can affect physiology like viable threats
Threat scanning competes with deep focus and recall

“The barrerow reflex response is essentially like cruise control for your blood pressure.”
Dr Jay Wiles · 41:00

“It's not a viable threat. It's a perceived threat, but it's having the impact on your physiology and your mental acuity like a viable threat…”
Dr Jay Wiles · 44:00

#baroreflex#blood pressure#mental acuity#performance

Explainer48:00

HRV Is a Family of Metrics, Not One Wearable Number

Wearables commonly display a time-domain measure based on intervals between beats, but HRV analysis can also separate the signal into frequency bands. Wiles uses an EEG analogy to explain very-low-, low-, and high-frequency power and what they reveal about cardiovascular oscillations.

Time-domain indices measure timing differences between successive beats
Frequency analysis decomposes raw intervals into component rhythms
Slow breathing creates large low-frequency heart-rate oscillations
High-frequency power reflects ordinary respiratory sinus arrhythmia at rest

“it's in milliseconds, we call that a time domain indicy.”
Dr Jay Wiles · 48:00

“It's the very low frequency band, low frequency and high frequency.”
Dr Jay Wiles · 49:30

#hrv metrics#frequency bands#wearables#physiology

Explainer1:56:30

Sleep Is the Canary for Nervous-System Dysregulation

Wiles places sleep at the base of health because it repairs the nervous system after daily psychological and physiological demands. Overnight measurement also removes many daytime variables, making sleep a useful window into baseline autonomic regulation and fragmentation.

Sleep disruption can signal nervous-system dysregulation
Sleep is intended to repair accumulated daily strain
Overnight data offers a comparatively blank canvas for observing regulation
Fragmentation can block deeper restorative sleep and increase wakefulness

“Sleep is is the canary in the coal mine.”
Dr Jay Wiles · 1:56:30

“You can't fake regulation during sleep.”
Chris Williamson · 1:59:30

#sleep#recovery#autonomic regulation#fragmentation

Story· 1

Story1:25:30

Why Bottom-Up Regulation Can Open the Door to Therapy

A veteran's body reacted to approaching a car before he consciously connected driving with wartime IED experiences. Wiles argues that physiological regulation can make cognitive therapies easier to engage with, rather than replacing evidence-based psychotherapy.

The body can detect and react to learned threat cues before conscious appraisal
Avoidance can reinforce a physiological fear cycle
Bottom-up regulation can prepare someone for top-down processing
CBT, ACT, and other therapies remain valuable rather than being displaced

“trying to change the mind with the mind is a bit like tugof-war.”
Dr Jay Wiles · 1:31:00

“changing the mind with the body tends to be a lot more efficient”
Dr Jay Wiles · 1:31:30

#therapy#trauma#bottom-up regulation#emotions

Q&A· 1

Q&A1:45:30

Should Athletes Downregulate Before Competing? It Depends

Pre-performance regulation should match the athlete's starting state rather than follow one universal routine. Wiles contrasts an over-aroused hockey player who struggled with game nerves with baseball pitchers who sometimes needed more activation before competing.

Downregulation can help an athlete overwhelmed by game nerves
An under-activated athlete may need to mobilize rather than calm down
The same athlete may benefit from resonance breathing after competition
Performance protocols should respond to autonomic state

“It depends on their level of autonomic dysregulation.”
Dr Jay Wiles · 1:46:00

“I'm not going to have them probably do as much resonance breathing before they go out,”
Dr Jay Wiles · 1:47:00

#athletes#performance anxiety#arousal#recovery

Takeaway· 1

Takeaway23:30

The Main Modifiable Drivers of Heart Rate Variability

Cardiorespiratory fitness, chronic health conditions, and accumulated stress load can influence HRV. Wiles recommends improving fitness for its broader health benefits and treating higher HRV as a possible byproduct rather than the sole objective.

Cardiorespiratory fitness can lower resting heart rate and raise baseline HRV
Cardiovascular disease, diabetes, and chronic pain can lower HRV
Chronic stress can make the nervous system more rigid and less adaptive
HRV should be used with other health metrics

“The biggest one is cardiorespiratory fitness.”
Dr Jay Wiles · 23:30

“I actually think it's best used in conjunction with other metrics.”
Dr Jay Wiles · 24:00

#cardio fitness#chronic stress#health conditions#hrv